How would I create a circular brick platform?
You can use array modifiers.
1st create a nice brick.

Then add an array modifier with a relative offset of 1 on X axis. Change the count to see the effect (I used 5), but it won't be used later.

Add another array modifier with a relative offset of 1 in Y axis. The count will be used and can be adjusted as you like.

Add a curve circle. It has to be a curve, not a mesh.

Select your brick and add a curve modifier, set the "object" as your curve circle.

You can see the shape changing to semi-circular.
Now in the 1st array modifier, change the fit type to "fit curve"

This will adjust the number of bricks to fit the curve's length. Scale smoothly your brick to adjust.